Developing cartridge

Abstract

A process cartridge, which includes a developing cartridge and a photosensitive cartridge for use with an image forming apparatus including a driving force output part and a feeding part, is provided. The developing cartridge includes a developer carrier, a first electrode provided at one side thereof, and a driving force receiving part provided at another side thereof and aligned with the first electrode such that the driving force receiving part overlaps the first electrode in a side view. The photosensitive cartridge, to which the developing cartridge is removably mounted, includes a photosensitive member, and a second electrode that contacts the first electrode when the developing cartridge is mounted in the photosensitive cartridge and that contacts the feeding part when the photosensitive cartridge is mounted in the image forming apparatus. The first electrode is pressed toward the driving force receiving part by contact with the second electrode.

The invention claimed is: 
     
       1. An image forming apparatus comprising:
 a cartridge comprising:
 a developing roller; 
 a first electrode having an exposure portion; and 
 a housing having a wall which partitions a developer accommodation chamber for accommodating developer and a developing chamber to which the developing roller is arranged; and 
 
 a frame configured to support the cartridge, the frame comprising a second electrode configured to be electrically coupled to the first electrode, 
 wherein the cartridge comprises a cover having an opening for exposing the exposure portion of the first electrode therefrom, and 
 wherein the exposure portion of the first electrode overlaps with the wall when viewed from an axis direction of the developing roller. 
 
     
     
       2. The image forming apparatus according to  claim 1 , wherein the first electrode overlaps with the second electrode when viewed from the axis direction in a state where the cartridge is mounted to the frame. 
     
     
       3. The image forming apparatus according to  claim 2 , further comprising:
 a body casing comprising a body side electrode that is configured to be electrically coupled to the second electrode. 
 
     
     
       4. The image forming apparatus according to  claim 1 , wherein the first electrode has a plate shape. 
     
     
       5. The image forming apparatus according to  claim 1 , wherein one of the first electrode and the second electrode comprises a metal plate, and the other one of the first electrode and the second electrode comprises an elastic member. 
     
     
       6. The image forming apparatus according to  claim 1 , wherein the housing has a box shape. 
     
     
       7. A cartridge comprising:
 a developing roller; 
 a housing comprising a wall which partitions a developer accommodation chamber for accommodating developer and a developing chamber to which the developing roller and a layer thickness restriction blade are arranged; 
 a first electrode having an exposure portion; and 
 a cover having an opening for exposing the exposure portion of the first electrode therefrom, 
 wherein the exposure portion of the first electrode overlaps with the wall when viewed from an axis direction of the developing roller. 
 
     
     
       8. The cartridge according to  claim 7 , wherein the first electrode has a plate shape. 
     
     
       9. The cartridge according to  claim 7 , wherein the first electrode is configured to be electrically coupled to the developing roller. 
     
     
       10. The cartridge according to  claim 7 ,
 wherein the cartridge is configured to be removably mounted to a frame, the frame comprising a second electrode that is configured to be electrically coupled to the first electrode, and 
 wherein the second electrode overlaps with the wall when viewed from the axis direction of the developing roller in a state where the cartridge is mounted to the frame. 
 
     
     
       11. A cartridge comprising:
 a developing roller; 
 a housing comprising a wall which partitions a developer accommodation chamber for accommodating developer and a developing chamber to which the developing roller and a layer thickness restriction blade are arranged; 
 a first electrode; 
 a second electrode being different from the first electrode; and 
 a cover covering the first electrode and not covering the second electrode, 
 wherein the first electrode overlaps with the wall when viewed from an axis direction of the developing roller. 
 
     
     
       12. The cartridge according to  claim 11 , wherein the first electrode has a plate shaped exposure portion. 
     
     
       13. The cartridge according to  claim 11 , wherein the first electrode is configured to be electrically coupled to the developing roller. 
     
     
       14. The cartridge according to  claim 11 ,
 wherein the electrode has an exposure portion, 
 wherein the cartridge is configured to be removably mounted to a frame, the frame comprising a second electrode that is configured to be electrically coupled to the exposure portion of the electrode, and 
 wherein the second electrode overlaps with the wall when viewed from the axis direction of the developing roller in a state where the cartridge is mounted to the frame.